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GE THR5616
Product Name: GE THR5616 Thermal Overload Relay
Product Overview: The GE THR5616 is a thermal overload relay produced by General Electric (GE), specifically designed for overload protection of three-phase AC motors, achieving overload trip protection through bimetallic thermal elements that sense heat generated by motor current.
Detailed content
Technical Specifications:
- Series: THR Series Thermal Overload Relay
- Rated Current Range: 9 A to 16 A (adjustable)
- Rated Voltage: 690 V AC and below
- Phases: Three-phase (3P)
- Frequency: 50 Hz / 60 Hz
- Trip Class: Class 10A (compliant with IEC 60947-4-1)
- Contact Configuration: 1 NO + 1 NC auxiliary contacts
- Ambient Temperature: -20°C to +60°C
- Protection Rating: IP20 (front), IP40 (with cover)
- Mounting: 35 mm DIN rail
Functional Features:
- Bimetallic thermal element precisely senses motor overload current
- Current adjustment knob for continuous setting within rated range
- Manual/automatic reset selector switch
- Trip indicator for visual trip status display
- Test button for simulating trip to verify function
Working Principle: During normal motor operation, heat generated by current through the thermal element reaches equilibrium with dissipation, and the bimetallic element maintains its original shape with contacts not acting. When overloaded, excessive heat causes the bimetallic element to bend and trigger the trip mechanism.
Structural & Material Features:
- Modular compact design, width adapted to standard distribution cabinet
- Front face: Current setting dial (0.63-1.0 times rated current adjustable)
- Top: Trip status indicator window (red/green)
- Bottom: DIN rail clip for quick installation/removal
- Enclosure: Flame-retardant PA66 polyamide engineering plastic (UL94 V-0)
- Internal Components: Bimetallic element (iron-nickel alloy), silver alloy contacts
- Terminals: Phosphor bronze with tin plating
- Adjustment Knob: ABS engineering plastic
Application Scenarios: Manufacturing, pump stations, fan systems, compressors, conveyor belts, HVAC systems.
Installation Requirements:
- Install on DIN rail inside motor control cabinet
- Used in conjunction with contactor, series-connected in control circuit
- Select appropriate conductor cross-section based on rated current (16 A corresponds to 2.5 mm² copper wire)
- Avoid direct heat radiation at installation location
Usage Notes:
- Setting current value must match motor rated current
- After each trip, wait for bimetallic element to cool (approx. 3-5 minutes) before resetting
- Regularly verify trip function using test button
- When ambient temperature exceeds 40°C, derating is required
